Vim is frozen when completing with ** pattern

[phongnh]

Hi @prabirshrestha,

When I am typing a text like coverage/**/, it triggered file completion but vim is frozen immediately. Maybe it is trying to glob with ** pattern.

Here is minimal vimrc I used to reproduce the issue

set encoding=utf-8
scriptencoding utf-8

set nocompatible
set termguicolors

if &shell =~# 'fish$'
    if executable('zsh')
        let &shell = exepath('zsh')
    elseif executable('bash')
        let &shell = exepath('bash')
    endif
endif

set runtimepath^=~/.vim/plugged/asyncomplete.vim
set runtimepath^=~/.vim/plugged/asyncomplete-file.vim
syntax on
filetype plugin indent on

let g:asyncomplete_auto_popup  = 1
let g:asyncomplete_popup_delay = 100

call asyncomplete#register_source(asyncomplete#sources#file#get_source_options({
            \ 'name':      'file',
            \ 'allowlist': ['*'],
            \ 'priority':  10,
            \ 'completor': function('asyncomplete#sources#file#completor'),
            \ }))

Thanks for awesome complete plugins.